Process for the manufacture of printing colors or ink



. Patented Mar. 9, 1926.-

UNITED. STATES 1,576,408 P TENT OFFICE.-

HERMANN GAJAR,,OF VIENNA, AUSTRIA.

' rnocnss r03 THE'MANUFACTURE or PRINTING ooLons on INK.

No Drawing.

ment colors for printing, manufactured by the wet process, presents in many cases great difliculties, as it is in a majority of cases impossible to ensure to said colors the same degree of fineness after drying as they possessed in the wet state. For the. foregoing reason the manufacturers of printing colors or ink have been trying for a longtime to combine the pressed or squeezed but still moist color-paste directly with varnish so as tion of the water.

however on the one hand very tedious andtoget a perfectly fine end product. For this purpose the liquid paste and varnish, after having been thorou hly mixed, were passed through color grinding mills" until complete evaporation of the'water' had ensued. At times these previously used grinding mills have been provided with heating means ordevices to assist and complete the evapora- This prior method was evaporation of Water by the use of three high rolling mills commomilxy employed and provided with heating s incurred cone]. siderable expense, and on the other hand it was found impossible to remove by this operation all traces of water from the mixture, which is a serious drawback when such colors were to bemixed with other colors. A further disadvantage consists in the risk of formation of linoleates or resinatesof aluminium, lead and other metal compounds,

whereas in the finished product from which water has been fully evaporated, the formation of these metal compounds will not 00- ,cur,.or at least only very slowly. The whole of the water could be of course evaporated by heating to about 120 C., but at such a high temperature the printing colors or ink would strongly thicken, they would get the 1- so-called gummy conslstency which would render them perfectly useless for printing 'pnrposesfi" '5, The process according to' the present inftioniprovides for the complete'separa- Application filed December 5, 1923. Serial No. 678,754

tion of water from the mixture of the watery paste and the varnish .at low temperatures. The improved process is highly economical and yields excellent fine products .of advantageous consistency. The present process consists substantially in treating the mixture of the watery paste and the varnish in a mixing machine of the kind of Werner; Pfieiderer machines, and then in evaporating the water by the action of steam and vacuum which should be as high as possible (about 1 cm. vacuum). The process is completed in a few hours, and the color or ink dis charged from theapparatus is at once ready for printing, provided there are no accidental impurities found therein.

Ewample.l74 kg. yellowlac forming a."

watery paste, dry contents 30%, consisting. of alummum hydroxide, blanc fixe, sulfon yellow B. conc. (Farbenfarbiken' vorm.

Friedr. Bayer & Co.) in the form of its/ barium salt, and 47 kg. thin linseed-oil varnish are stirred for half-an-hour in a steam-jacketed mixing machine connected'toa vacuum pump, then after opening the steam valve and discharging,- the water" is eva orated. The process requires about 'wor ing hours and yields. kg. of color 1 or ink ready for use on the offset press. The

quantity ofwater evaporated amounts to 121 kg. w g What I claim is:

1. The process of manufacturing colored printing ink, consisting in subjecting an ink composition of a watery paste character. i

to the action of steam jacketed mixing and lev'igating mechanism v h vacuu'mecreatmg source, andthen evaporatconnected atajy ing the water from the composition by the I action of steam and. a relatively high vacuum of about 65 cm. I

2. The process of manufacturing colored printing ink for use on paper, consisting. in subjecting a watery paste and varmshink composition to the action of a steam jacketed mixing machine at. a low temperature, and then expelling and evaporatin the water from the composition by'the action of steam and a relatlvely high vacuum of about 65 cm.

In testimony whereof I have signed my name to this specification. w

DR. i AJAR. 

